Either of these steps could have removed track points, saving as TCX might have worked because it removed less points? Did you use a different exporter/converter?
"Create route in ride with gps
Export as GPX"
Also, settings on the Course allow you to 'Lock to Road' on the 800. I presume the 810 has similar.
As far as I'm aware TCX is just a GPX with extra shit like HR, power, cadence stuff tacked on.
Either of these steps could have removed track points, saving as TCX might have worked because it removed less points? Did you use a different exporter/converter?
"Create route in ride with gps
Export as GPX"
Also, settings on the Course allow you to 'Lock to Road' on the 800. I presume the 810 has similar.
As far as I'm aware TCX is just a GPX with extra shit like HR, power, cadence stuff tacked on.